why is my Ford Explorer's battery draining quickly while parked

Solution

1. Preparation

• Tools Required: Multimeter, OBD-II scanner, basic hand tools (screwdrivers, wrenches).
• Disconnect the negative battery terminal to prevent electric shock.

2. Address Parasitic Draw

• Sub-step 1: If a parasitic draw is identified (typically more than 50 mA), start removing fuses from the fuse box until the draw drops below this level.
• Sub-step 2: Identify the circuit associated with the removed fuse and inspect the components connected to it for faults, such as stuck relays or faulty modules.

3. Repair or Replace Components

• Sub-step 1: If a faulty component is found, replace it with a new part that is compatible with the vehicle.
• Sub-step 2: Reconnect all fuses and ensure that no additional components are drawing current when the vehicle is off.

4. Assess Battery and Charging System

• Sub-step 1: If the battery is old (more than 3-5 years), consider replacing it with a new battery that matches the specifications.
• Sub-step 2: Test the alternator by connecting the multimeter to the battery while the engine is running; voltage should be between 13.7 and 14.7 volts. If not, replace the alternator.